Any Rocka riders got a bitchin seat installed?  Any positive/negative thoughts whether I should get one or not? 

Yes Philthy, beats the Danny Grey seat hands down, covers the frame better, go for the bullhide centre insert for durability.

Ta mate, I've got no room for me swag then. Sussed out the seats on the rocka's with bags, looks shit hot!   I suppose a good quality sleeping bag and foam mattress will stuff in me bags.  

So the back of the seat moves with the fender??

Yeah Dan.  Check out  The Workshop/Rocker seat fucked again

I know Im not the sharpest tool in the shed, but how can it be comfortable to ride with the seat moving up & down with the wheel?

Yes I may be a little bias but the heartland is still the best option for the rocker,